Machine for dressing stone



J. M. RICE.

MACHINE FOR DRESSING STONE.

APPLICATION FILED MAYI.1920.

Patented Nov. 8, 1921 3 SHEETS-SHEET I.

J. M. RICE.

MACHINE FOR DRESSING STONE.

APPLICATION FILED MAY 1, 1920.

1,396,144, PatentedNo v. 8,1921.

3 SHEETS-SHEET 2. JET 3- J. M. RICE. MACHINE FOR DRESSING STONE.

APPLICATION FILED MAY 1. I920.

Patented Nov. 8, 1921.

J/ f/ iz'e Wm, I

3 SHEETS-SHEET 3.

I I 0 I I PATENT OFFICE.

JAMES M. RICE, LINEVILLE, ALABAMA.

MACHINE FOR DRESSING STONE.

Specification of Letters Patent.

Patented 0v. 8, 1921.

Application filed May 1, 1920. Serial No. 378,196.

To all whom it may concern Be it known that I, JAMES M. RICE, a citizenof the United States, residing at Lineville, in the county of Clay and'State of Alabama, have invented certain new and useful Improvements inMachines for Dressing Stone, of-which the following is a specification,reference-being had to the accompanying drawings.

This invention relates to certain improvements in machines for dressingstone and has relation more particularly to a machine of this generalcharacter especially designed and adapted for use in connection withmillstones, and it is an object of the invention to provide a novel andimproved device of this general character which may be employed toresurface or dress a millstone, or the like, without the necessity ofremoving such stone from working or applied position.

It is also an object of the invention to provide a novel and improvedmachine of this general character including an impact tool andwhereinmechanism is employed for operating said tool with the mountingfor the stone serving as a driving element.

Another object of the invention is to provide a novel and improvedmachine of this general character embodying a pickaX, together withmeans for imparting the requisite strokes or impulses to the pickax and"wherein said pickax is of a type whereby the same may be reversed sothat the life of the same is materially prolonged.

An additional object of the invention is to provide a novel and improvedmachine of this general character which may be employed with equalfacility in connection with a millstone, or the like, revolving abouteither a horizontal or vertical axis.

Furthermore, it is an object of the invention to provide a machine ofthis general character with novel and improved means whereby the strokeof the working tool may be readily regulated, together with meanswhereby the angle of the working edge of the tool with respect to thesurface of the stone may be varied as required.

The invention consists in the details of construction and in thecombination and arrangement of the several parts of my improved machinewhereby certain important advantages are attained and the devicerendered simpler, less expensive, and otherwise more convenient andadvantageous for use, as w ll be h r inaf er m re ful y et fo th.-

The novel features of my invention will hereinafter bedefinitelyclaimed.

In order that my invention may be the better understood, I will nowproceed to describe the same with reference to the accompanyingdrawings, wherein:

igure 1 is a view partly in elevation and partly in section,illustrating a machine constructed in accordance with an embodiment ofmy invention;

Fig. 2 is an enlarged fragmentary view partly in top plan and partly insection, illustrating certain details of construction as hereinembodied;

Fig. 3 is a" fragmentary view partly in section and partly in sideelevation, illustrating in detail means for reciprocating the toolcarrying rod and for imparting axial rotation thereto;

Fig. 4: is a fragmentary view partly in elevation and partly in sectionof the lower portion of the structure illustrated in Fig. 3 andsubstantially at right angles thereto;

Fig. 5 is a sectional view taken substantially on the line 5-5 of Fig.3;

Fig. 6 is a fragmentary view in end elevation, illustrating in detailthe means for intermittently rotating the threaded shaft;

Fig. 7 is a View in side elevation, illustrating a machine constructedin accordance with an embodiment of my invention and mounted for use inconnection with the stones supported by'a horizontally disposed spindle;and

Fig. 8 is a fragmentary View in elevation of the structure asillustrated in Fig. 7.

As disclosed in the accompanying drawings, M denotes a millstone mountedupon the vertically disposed spindle S and which spindle is adapted tobe driven in any desired manner whereby the millstone rotates around avertical axis. 1 denotes a coupling adapted to be clamped to the upperend portion of the spindle S through the instrumentality of the screw 2,or the like. Also extending within the coupling 1 is an end portion ofan elongated shaft 3 which is secured to the coupling 1 for rotationtherewith by the screw. 4, or the like. F denotes a frame embodying aside member 5 and the end members 6 and 7. The member 6 constitutes abarrel or sleeve loosely mounted upon the shaft 3 whereby said shaft iscapable of rotary movement independently'of the frame F, The endportions of the members 6 and 7 remote from the side member 5 rotatablysupport a shaft 8 substantially in parallelism with the side member 5.Locked to the shaft 8 at a point in close proximity to the end member orsleeve 6 is a friction wheel 9 in driven contact with the friction wheel10 locked to the shaft 3. By this arrangement, as the shaft 3 rotates,the shaft 8 will also be caused to revolve.

Rotatably supported by the end members 6 and 7 at a desired pointbetween the side member 5 and the shaft 8 is a threaded shaft 11. Oneend portion of the shaft 11 extends outwardly of the end member 7 andsecured to said extended portion is a feed ing gear or ratchet 12adapted to be intermittently rotated by the lever 0r pawl 14 engagingsaid gear or ratchet. The outer end portion of the lever or pawl i l-ispivotally engaged with a rod 15. One end portion of the rod 15 isoperatively engaged with a wrist pin 16 carried by a disk 17, or thelike, fixed to an ended end portion of the shaft'8. The opposite endportion ofthe rod 15 isslidably disposed through a guide bracket. 18mounted upon the end of the member 7 remote from the shaft 8. As theshaft 8 rotates, the rod 15 will be reciprocatedcausing the pawl orlever 14 to intermittently engage the gear or ratchet 12, resulting inan intermittent rotation of the shaft 11. The working end ofthe pawl orlever 1 1 engages the gear or ratchet 12 to one side of its center andby throwing said ear or ratchet 12 to either side, the shaft 1 may becaused to rotate in the direction desired. 7

The wrist pin 16 is adjustable radially of the disk 17 so that thestroke of the rod 15 may be adjusted to regulate or vary, as may 7 bedesired, the extent of rotation of the shaft 11 upon the working strokeofthe rod 15. In the present embodiment of my invention, the adjustmentof the wrist pin 16 is accomplished by having said pin slidably engagewithin a radially disposed slot 19 and held in desired position by aclamping member 20.

C denotes a cylinder disposed substantially in parallelism with the endmembers 6 and 7 and which is provided at its "central portion with anoutstanding block 21 threaded uponthe shaftll so that as said shaft 11is intermittently rotated, the cylinder C will be caused to movelongitudinally thereof and in a direction radially of the millstone M sothat the surface of such stone may be properly dressed; Snugly fittingwithin the cylinder C and having reciprocatory movement therein is asecond cylinder 22. The cylinder 22 is provided with an outstandinglug23 which extends through a longitudinally disposed slot 24k in theadjacent wall of the cylinder C. The

opposite end portions ofthe cylinder C have coactmg therewith thecuffs25 slidably en'- urges the cylinder 22 in one direction and gagedwith the side member 5 and with the shaft 8 whereby further means areprovided for maintaining the cylinder C in applied position with respectto the frame F. Keyed to the shaft 8 for rotation therewith but capableof movement longitudinally thereof is an eccentric 26 which isconstantly in proper. position with respect to the lug 23 and saideccentric comprises two reversely directed arcuate arms 27 disposed ondesired curvatures and having their inner ends secured to the hubportion of the eccentric 26 at opposite sides of the axial centerthereof. The eccentric 26 is caused to move along the shaft 8 in thesame general direction as the movement of the cylinder C by the adjacentportion of the cylinder C and the side member of the adjacent cuff 25between which the eccentric 26 is positioned. I 85 28 denotes anelongated rod extending axially of the cylinder G freely disposedthrough the opposite ends or heads 29 thereof so that said rod iscapable of reciprocatory movement. The rod 28 also extends axiallythrough the cylinder 22 and is secured to the heads 30 thereof forreciprocatory movement therewith but capable of independent rotarymovement. In threaded engagement with the outer head or end 29 of thecylinder C is a tubular stem 31 into which the adjacent end portion ofthe rod 28 telescopes and the inner end of said stem contacts with adisk 32 loosely mounted upon the portion of the rod 28 within thecylinder C. Interposed between the disk 32 and the adjacent or outerhead 30 of the cylinder 22 is a coil spring 33 en-v circling the rod 28.The spring 33 constantly 1.05 the tension of said spring may be variedbyrotating the' stem 31. The outer endof the .stem 31 is provided withahand wheel 34 to facilitate the requisite'rotation of said stem.

An opposite'end'portion of the rod 28 extends a material distanceoutwardly of the inner end of the cylinder C and has secured to its endportion a tool holder 35 substantially in the form of an inverted- L.The stem-'36 of the'holder 35 is provided with a plurality oflongitudinally spaced openings 37 whereby the clamping screw 38 maybeadjustably engaged therewith so that a corresponding adjustment may behad with the tool or pickax 39. The tool or pickax 39 includes theoppositely disposed points to so that said tool may be reversed when required in order that the life of the tool or pickax maybe materiallyprolonged.

' As the shaft 8 rotates, the eccentric 26 forces the cylinder 22 andthe parts carried thereby in a direction away from the work ormillstone' M by contact of the arms 27 with the'lug 23. The desiredworking strokes or impulses are imparted to the cyl- 130 inder 22 by thespring 33 as the arms 27 pass the lug 23.

In order to regulate the length of the stroke of the cylinder 22 or moreparticularly the rod 28 and the tool 39 carried thereby, I provide therod 28 at a predetermined point beyond the inner head or end 29 with afixed collar 43. The lower cufi' 25 and the cylinder C are provided witha pair of brackets 44 spaced longitudinally of the cylinder O and whichrotatably support a threaded shaft 45 provided at its outer end with anoperating head or end wheel 46 whereby the shaft may be readily rotated.The bracket 44 carried by the cuff 25 also serves as a guide, for anelongated arm 47 disposed substantially in parallelism with the rod 28.The arm 47 outwardly of said bracket 44 is provided with a pair oflongitudinally spaced lugs 48 operatively engaged with the threadedshaft 45 whereby said arm 47 may be moved longitudinally in thedirection desired upon requisite rotation of the shaft 45.

The arm 47 at its forward end is provided with a lateral extension 49substantially at right angles thereto and positioned outwardly of'thecollar 43. The rod 28 moves freely through the outer end portion of theextension 49 whereby said extension 49 serves as a stop coacting withthe collar 43 to limit the extent of movement of the rod 28 under theinfluence of the spring 33. By moving the extension 49 in a directionaway from the collar '43, the stroke of the rod 28 will be lengthenedand upon movement of the extension 49 toward the collar 43, said strokewill be shortened.

It is also of advantage to rock the rods 28 in order to change the angleof the cutting edge of the tool 39. In the present embodiment of myinvention, this adjustment is accomplished through the instrumentalityof the handle or lever 50 having one end portion extending through atransversely disposed slot 51 in a wall of the cylinder G and through arelatively large opening 52 in the adjacent wall of the cylinder 22 andsecured to the rod 28. The angle of the cutting edge of the tool 39 maybe changed as required by imparting the requisite swinging movement tothe handle or lever 50. The opening 52 is of such length whereby noobstruction or hindrance is offered to the requisite reciprocatorymovement of the cylinder 22 and also of requisite width for the samepurpose. It is also desired that the inserted end of the handle or lever50 be loosely engaged with the rod 28 and this is accomplished byproviding the rod 28 with an angular portion 53 of desired length andwith which the inserted end portion of the handle or lever 50 is engagedand in a manner whereby the rod 28 is capable of endwise movementindependently of said rod independently handle or lever 50 but rotatedor rocked upon swinging movement of said handle or lever 50.

In Figs. 7 and 8, I disclose an embodiment of invention wherein amachine is adapted toidress the millstone M, or the like, rotating abouta horizontal axis. In this arrangement, the machine is constructed inthe same manner as hereinbefore set forth except that the side member orsleeve -5' is mounted upon a horizontally disposed shaft 54 rotatablysupported by a supporting structure or frame A. One end portion of theshaft 54 has coupled thereto a drum or pulley 55 in driving connectionwith the spindle S of the millstone M, or the like, by the belt 56.

From the foregoing description, it is thought to be obvious that amachine constructed in accordance with my invention is particularly welladapted for use by reason of the convenience and facility with which itmay be assembled and operated, and it will also be obvious that myinvention is susceptible of some change and modification withoutdeparting from the principles and spirit thereof, and for this reason Ido not wish to be understood as limiting myself to the precisearrangement and formation of the several parts herein shown in carryingout my invention in practice except as hereinafter claimed.

I claim 1. A machine for dressing stone comprising, in combination, asupporting structure, a tubular member supported thereby, a hollowmember arranged within the tubular member for reciprocatory movement,the wall of the hollow member being provided with a longitudinallydisposed slot, an outstanding lug carried by the hollow member andextending through the slot of the tubu lar member, a rotatable camelement arranged for contact with the lug to intermittently move thehollowmember in one d rection, means for rotating the cam member,

means for constantly urging the hollow member in the opposite direction,a rod extending through both the tubular member and the hollow member,means for connecting the hollow member and the rod for unitaryreciprocatory movement, a stone working tool carried by the rod, andmeans operatively engaged with the rod at a point within the hollowmember for rotating said of its reciprocationv 2. A machine for dressingstone comprising, in combination, a supporting structure, a tubularmember supported thereby, a hollow member arranged within the tubularmember for reciprocatory movement, the wall of the hollow member beingprovided with a longitudinally disposed slot, -an outstanding lugcarried by the hollow member and extending through the slot of the tubu-V i r 1,396,144

lar member, a rotatable cam element artary reciprocatory movement, astone work-.

ing tool carried by the rod, a wall of the tubular m ember beingprovided with a transversely disposed slot, the adjacent wall of thehollow member being provided with an opening, said opening being bothrelatively wide and long, the rod having rotation independently of thehollow member, and an arm extending through the slot of the tubularmember and the opening of the hollow member and the inserted end of thearm having sliding connection with the rod, said arm providing means toindependently rotate the rod, the sliding connection between the arm androd permitting the rod to reciprocate independently of the arm.

3. Av machine for dressing stone, compris ing, in combination, asupporting structure, a tubular member carried thereby and having itsopposite end portions closed, a hollow member mounted within the tubularmember for reciprocation therein, said hollow member having its oppositeend portions closed, a rod extending through the tubular member forreciprocation, said rod also extending through the hollow member, meanscarried by the rod and coacting with the hollow member whereby saidhollow member and rod reciprocate in unison and permitting the rod tohave rotation independently of the hollow member, means within thetubularmember and engaging an end of the hollow member for constantlyurging the hollow member in one direction, driven means forindependently moving the hollow member in the opposite direction, a toolcarried by an extended end portion of the rod, and means for rotatingthe rod independently of the hollow member. I

at. A machine for dressing stone compris ing, in combination, asupporting structure, a tubular member carri d by said supportingstructure, a rod operatively supported by the tubular membersforreciprocation, means for reciprocating said rod, a threaded shaftrotatably supported by the member, an elongated arm provided' with lugsoperatively engaged with the threaded shaft, a lateral extension carriedby the arm and through which an'end portion of the rod is freelydisposed, anda collar carried by the rod inwardly of the extension ofthe arm, said collar contacting with the extension of the arm to limitthe extent of movement of the rod in one direction.

5. A machine for dressing stone compriS- ing, in combination, asupporting structure, a tubular member carried by saidsupportingstructure, a rod operatively supported by the tubular member forreciprocation, means for reciprocating said rod, a threaded shaftrotatably supported by the member, an elon gated arm provided with lugsoperatively engaged with the threaded shaft, a lateral extension carriedby the arm and through which an end portion of the rod is freelydisposed, a collar carried by the rod inwardly of the extension of thearm, said collar contacting with the'extension of the arm to limit thextent of movement of the rod in one direction, and means for rotatingthe shaft to move the arm to vary the position of the lateral extensionof the arm with respectto the'collar carried by the rod.

In testimony whereof I hereunto afiix my signature;

' JAMES M. RICE.

